diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
index cbc3dc4c90..d14119133a 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php
@@ -421,7 +421,7 @@ class WP_REST_Autosaves_Controller extends WP_REST_Revisions_Controller {
 		if ( ! empty( $meta ) ) {
 			foreach ( $revisioned_meta_keys as $meta_key ) {
 				if ( isset( $meta[ $meta_key ] ) ) {
-					update_metadata( 'post', $revision_id, $meta_key, $meta[ $meta_key ] );
+					update_metadata( 'post', $revision_id, $meta_key, wp_slash( $meta[ $meta_key ] ) );
 				}
 			}
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 1a9cff07a7..e1f1e8a387 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-beta1-56744';
+$wp_version = '6.4-beta1-56745';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.